i generally find the flavour of nectarines to be standardly sweet, whereas peaches vary a lot, but there are a couple of peach cultivars whose flavour cannot be beat, so for that reason, i choose peaches

I love both, but prefer nectarines. Sometimes I DON'T like the way the peach skin feels in my mouth, and nectarines are nice and smooth! Also I think I prefer the flavor just a little bit more. I can't wait until it's nectarine season at my farmer's market. Kashi Go Lean Crunch + nectarines + blueberries is my favorite breakfast item in the world.